//******************************************************************
//******************************************************************
//**********          ANts Peer To Peer Sources        *************
//
// ANts P2P realizes a third generation P2P net. It protects your
// privacy while you are connected and makes you not trackable, hiding
// your identity (ip) and crypting everything you are sending/receiving
// from others.

// Copyright (C) 2004  Roberto Rossi

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.


package ants.p2p;

public class DataBandwidthFilterOut
    extends Thread {

  static int used = 0;
  static int interval = 1000;
  static DataBandwidthFilterOut instance = null;

  public DataBandwidthFilterOut() {
    this.start();
  }

  public static DataBandwidthFilterOut getInstance() {
    if (instance != null)
      return instance;
    else
      return instance = new DataBandwidthFilterOut();
  }

  protected void bandwidthCheck() {
    synchronized (DataBandwidthFilterOut.getInstance()) {
      while (used >= (NeighbourAnt.bandwidthLimit - NeighbourAnt.queryBandwidthLimit)) {
        try {
          this.wait();
        }
        catch (Exception e) {
        }
      }
    }
  }

  public void writeData(long bytes) {
    bandwidthCheck();
    Thread.currentThread().setPriority(10);
    used += bytes;
  }

  public void run() {
    while (true) {
      used = (int) Math.max(0, Math.floor(used - (NeighbourAnt.bandwidthLimit - NeighbourAnt.queryBandwidthLimit)));
      this.doNotify();
      this.doSleep();
    }
  }

  public synchronized void doNotify() {
    this.notify();
  }

  public void doSleep() {
    try {
      sleep(interval);
    }
    catch (Exception e) {
      System.out.println("Unexpectewd Wake Up");
    }
  }
}
